You are mixing things up a little in your use of scare, are you trying to use it as a verb or noun ?
Try modifying your sentence....then select what you are trying to express.
"She threatened to kill herself, luckily nothing happened, but it scared me". (= made me extremely frightened)
scare; verb; to (make a person or animal) feel frightened:
He scared me out of my wits (= made me extremely frightened) by driving so fast.
Meeting new people scares me stiff/to death (= makes me extremely nervous and worried).
She scared the hell/life/living daylights out of me (= frightened me very much) when she fell out of the tree.
You gave us a real scare, when you threatened to kill yourself. (= frightened us)
scare: noun: a sudden feeling of fear or worry:
I got/had a scare (= I was very worried) when I looked at my bank statement this morning!
You gave us a real scare (= frightened us) when you fainted, you know.
Ref CED Scare